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/* |
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* UAE - The Un*x Amiga Emulator |
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* |
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* MC68000 emulation |
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* |
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* Copyright 1995 Bernd Schmidt |
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*/ |
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|
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#ifndef NEWCPU_H |
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#define NEWCPU_H |
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|
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#include "m68k.h" |
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#include "readcpu.h" |
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#include "spcflags.h" |
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|
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extern int areg_byteinc[]; |
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extern int imm8_table[]; |
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|
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extern int movem_index1[256]; |
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extern int movem_index2[256]; |
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extern int movem_next[256]; |
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|
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extern int broken_in; |
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|
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/* Control flow information */ |
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#define CFLOW_NORMAL 0 |
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#define CFLOW_BRANCH 1 |
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#define CFLOW_JUMP 2 |
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#define CFLOW_TRAP CFLOW_JUMP |
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#define CFLOW_RETURN 3 |
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#define CFLOW_SPCFLAGS 32 /* some spcflags are set */ |
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#define CFLOW_EXEC_RETURN 64 /* must exit from the execution loop */ |
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|
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#define cpuop_rettype void |
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#define cpuop_return(v) do { (v); return; } while (0) |
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|
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#ifdef X86_ASSEMBLY |
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/* This hack seems to force all register saves (pushl %reg) to be moved to the |
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begining of the function, thus making it possible to cpuopti to remove them |
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since m68k_run_1 will save those registers before calling the instruction |
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handler */ |
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# define cpuop_tag(tag) __asm__ __volatile__ ( "#cpuop_" tag ) |
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#else |
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# define cpuop_tag(tag) ; |
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#endif |
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|
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#define cpuop_begin() do { cpuop_tag("begin"); } while (0) |
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#define cpuop_end(cflow) do { cpuop_tag("end"); cpuop_return(cflow); } while (0) |
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|
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typedef cpuop_rettype REGPARAM2 cpuop_func (uae_u32) REGPARAM; |
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|
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struct cputbl { |
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cpuop_func *handler; |
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uae_u16 specific; |
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uae_u16 opcode; |
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}; |
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|
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extern cpuop_rettype REGPARAM2 op_illg (uae_u32) REGPARAM; |
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|
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typedef char flagtype; |
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|
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struct regstruct { |
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uae_u32 regs[16]; |
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|
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uae_u32 pc; |
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uae_u8 * pc_p; |
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uae_u8 * pc_oldp; |
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|
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spcflags_t spcflags; |
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int intmask; |
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|
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uae_u32 vbr, sfc, dfc; |
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uaecptr usp, isp, msp; |
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uae_u16 sr; |
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flagtype t1; |
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flagtype t0; |
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flagtype s; |
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flagtype m; |
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flagtype x; |
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flagtype stopped; |
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|
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#if USE_PREFETCH_BUFFER |
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/* Fellow sources say this is 4 longwords. That's impossible. It needs |
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* to be at least a longword. The HRM has some cryptic comment about two |
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* instructions being on the same longword boundary. |
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* The way this is implemented now seems like a good compromise. |
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*/ |
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uae_u32 prefetch; |
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#endif |
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}; |
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|
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extern regstruct regs, lastint_regs; |
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|
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#define m68k_dreg(r,num) ((r).regs[(num)]) |
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#define m68k_areg(r,num) (((r).regs + 8)[(num)]) |
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|
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#define get_ibyte(o) do_get_mem_byte((uae_u8 *)(regs.pc_p + (o) + 1)) |
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#define get_iword(o) do_get_mem_word((uae_u16 *)(regs.pc_p + (o))) |
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#define get_ilong(o) do_get_mem_long((uae_u32 *)(regs.pc_p + (o))) |
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|
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#ifdef HAVE_GET_WORD_UNSWAPPED |
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#define GET_OPCODE (do_get_mem_word_unswapped (regs.pc_p)) |
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#else |
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#define GET_OPCODE (get_iword (0)) |
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#endif |
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|
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#if USE_PREFETCH_BUFFER |
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static __inline__ uae_u32 get_ibyte_prefetch (uae_s32 o) |
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{ |
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if (o > 3 || o < 0) |
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return do_get_mem_byte((uae_u8 *)(regs.pc_p + o + 1)); |
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|
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return do_get_mem_byte((uae_u8 *)(((uae_u8 *)®s.prefetch) + o + 1)); |
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} |
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static __inline__ uae_u32 get_iword_prefetch (uae_s32 o) |
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{ |
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if (o > 3 || o < 0) |
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return do_get_mem_word((uae_u16 *)(regs.pc_p + o)); |
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|
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return do_get_mem_word((uae_u16 *)(((uae_u8 *)®s.prefetch) + o)); |
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} |
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static __inline__ uae_u32 get_ilong_prefetch (uae_s32 o) |
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{ |
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if (o > 3 || o < 0) |
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return do_get_mem_long((uae_u32 *)(regs.pc_p + o)); |
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if (o == 0) |
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return do_get_mem_long(®s.prefetch); |
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return (do_get_mem_word (((uae_u16 *)®s.prefetch) + 1) << 16) | do_get_mem_word ((uae_u16 *)(regs.pc_p + 4)); |
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} |
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#endif |
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|
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#define m68k_incpc(o) (regs.pc_p += (o)) |
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|
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static __inline__ void fill_prefetch_0 (void) |
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{ |
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#if USE_PREFETCH_BUFFER |
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uae_u32 r; |
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#ifdef UNALIGNED_PROFITABLE |
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r = *(uae_u32 *)regs.pc_p; |
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regs.prefetch = r; |
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#else |
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r = do_get_mem_long ((uae_u32 *)regs.pc_p); |
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do_put_mem_long (®s.prefetch, r); |
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#endif |
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#endif |
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} |
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|
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#if 0 |
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static __inline__ void fill_prefetch_2 (void) |
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{ |
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uae_u32 r = do_get_mem_long (®s.prefetch) << 16; |
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uae_u32 r2 = do_get_mem_word (((uae_u16 *)regs.pc_p) + 1); |
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r |= r2; |
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do_put_mem_long (®s.prefetch, r); |
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} |
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#else |
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#define fill_prefetch_2 fill_prefetch_0 |
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#endif |
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|
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/* These are only used by the 68020/68881 code, and therefore don't |
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* need to handle prefetch. */ |
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static __inline__ uae_u32 next_ibyte (void) |
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{ |
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uae_u32 r = get_ibyte (0); |
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m68k_incpc (2); |
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return r; |
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} |
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|
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static __inline__ uae_u32 next_iword (void) |
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{ |
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uae_u32 r = get_iword (0); |
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m68k_incpc (2); |
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return r; |
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} |
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|
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static __inline__ uae_u32 next_ilong (void) |
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{ |
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uae_u32 r = get_ilong (0); |
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m68k_incpc (4); |
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return r; |
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} |
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|
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static __inline__ void m68k_setpc (uaecptr newpc) |
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{ |
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#if REAL_ADDRESSING || DIRECT_ADDRESSING |
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regs.pc_p = get_real_address(newpc); |
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#else |
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regs.pc_p = regs.pc_oldp = get_real_address(newpc); |
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regs.pc = newpc; |
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#endif |
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} |
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|
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static __inline__ uaecptr m68k_getpc (void) |
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{ |
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#if REAL_ADDRESSING || DIRECT_ADDRESSING |
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return get_virtual_address(regs.pc_p); |
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#else |
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return regs.pc + ((char *)regs.pc_p - (char *)regs.pc_oldp); |
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#endif |
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} |
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|
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#define m68k_setpc_fast m68k_setpc |
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#define m68k_setpc_bcc m68k_setpc |
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#define m68k_setpc_rte m68k_setpc |
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|
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static __inline__ void m68k_do_rts(void) |
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{ |
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m68k_setpc(get_long(m68k_areg(regs, 7))); |
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m68k_areg(regs, 7) += 4; |
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} |
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|
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static __inline__ void m68k_do_bsr(uaecptr oldpc, uae_s32 offset) |
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{ |
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m68k_areg(regs, 7) -= 4; |
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put_long(m68k_areg(regs, 7), oldpc); |
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m68k_incpc(offset); |
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} |
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|
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static __inline__ void m68k_do_jsr(uaecptr oldpc, uaecptr dest) |
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{ |
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m68k_areg(regs, 7) -= 4; |
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put_long(m68k_areg(regs, 7), oldpc); |
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m68k_setpc(dest); |
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} |
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|
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static __inline__ void m68k_setstopped (int stop) |
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{ |
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regs.stopped = stop; |
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/* A traced STOP instruction drops through immediately without |
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actually stopping. */ |
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if (stop && (regs.spcflags & SPCFLAG_DOTRACE) == 0) |
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SPCFLAGS_SET( SPCFLAG_STOP ); |
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} |
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|
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extern uae_u32 get_disp_ea_020 (uae_u32 base, uae_u32 dp); |
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extern uae_u32 get_disp_ea_000 (uae_u32 base, uae_u32 dp); |
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|
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extern uae_s32 ShowEA (int reg, amodes mode, wordsizes size, char *buf); |
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|
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extern void MakeSR (void); |
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extern void MakeFromSR (void); |
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extern void Exception (int, uaecptr); |
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extern void dump_counts (void); |
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extern int m68k_move2c (int, uae_u32 *); |
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extern int m68k_movec2 (int, uae_u32 *); |
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extern void m68k_divl (uae_u32, uae_u32, uae_u16, uaecptr); |
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extern void m68k_mull (uae_u32, uae_u32, uae_u16); |
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extern void m68k_emulop (uae_u32); |
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extern void m68k_emulop_return (void); |
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extern void init_m68k (void); |
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extern void exit_m68k (void); |
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extern void m68k_dumpstate (uaecptr *); |
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extern void m68k_disasm (uaecptr, uaecptr *, int); |
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extern void m68k_reset (void); |
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extern void m68k_enter_debugger(void); |
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extern int m68k_do_specialties(void); |
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|
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extern void mmu_op (uae_u32, uae_u16); |
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|
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/* Opcode of faulting instruction */ |
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extern uae_u16 last_op_for_exception_3; |
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/* PC at fault time */ |
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extern uaecptr last_addr_for_exception_3; |
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/* Address that generated the exception */ |
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extern uaecptr last_fault_for_exception_3; |
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|
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#define CPU_OP_NAME(a) op ## a |
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|
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/* 68020 + 68881 */ |
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extern struct cputbl op_smalltbl_0_ff[]; |
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/* 68020 */ |
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extern struct cputbl op_smalltbl_1_ff[]; |
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/* 68010 */ |
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extern struct cputbl op_smalltbl_2_ff[]; |
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/* 68000 */ |
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extern struct cputbl op_smalltbl_3_ff[]; |
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/* 68000 slow but compatible. */ |
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extern struct cputbl op_smalltbl_4_ff[]; |
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|
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extern void m68k_do_execute(void); |
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extern void m68k_execute(void); |
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|
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#endif /* NEWCPU_H */ |
